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Q.

A cylindrical drum open at the top contains 60 litres of water. It drains out through small hole opening at the bottom 20 litres of water comes out in time t1sec and the next 20 litres in further time  t2  sec and the last 20 litres in further time t3 then.

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a

t1

b

t1>t2

c

t1=t2=t3

d

t2>t1=t3

answer is A.

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